The definitive guide to CAM audit statistics. 40% of reconciliations contain errors. $5-15 billion in overcharges go unrecovered annually. Data from Tango Analytics, Deloitte, JLL, and BOMA.
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See How It WorksSee a sample report firstTL;DR: Five numbers define the CAM audit landscape in 2026. 40% of CAM reconciliations contain material billing errors (Tango Analytics, 2023). $5 to $15 billion in annual overcharges go unrecovered across U.S. commercial real estate (PredictAP, 2026). 15 to 20% of billed CAM is typically recovered when tenants audit for the first time (Springbord Research, 2024). Fewer than 15% of commercial tenants ever exercise their right to audit. And $25,000 is the average recovery per audit engagement across Deloitte's 10,000+ completed lease audits.
"I built CAMAudit because these numbers told a clear story: errors are everywhere, almost nobody checks, and the gap between what tenants pay and what they owe is measured in billions. The audit industry has existed for decades, but cost and complexity kept it out of reach for most tenants. After testing reconciliation samples from published audit cases through CAMAudit, the detection accuracy confirmed that software can surface the same errors that $5,000 engagements find." — Angel Campa, Founder of CAMAudit
40% of commercial CAM reconciliations contain material billing errors (Tango Analytics, 2023)
U.S. commercial real estate generates an enormous pool of operating expense pass-through charges every year. The total CAM pass-through market is estimated at $90 to $200 billion annually, with a bottom-up reconstruction centering around $130 to $140 billion (PredictAP, 2026).
The building blocks are independently verifiable:
| Property Type | Leasable Square Footage | Average CAM/SF | Source |
|---|---|---|---|
| Office | ~11 billion SF | $8 to $15/SF | Nareit, BOMA benchmarks |
| Retail | ~12 to 14 billion SF | $3 to $12/SF | CoStar, BOMA benchmarks |
| Industrial | ~15 to 21 billion SF | $0.15 to $4/SF | JLL, EIA CBECS |
When 25 to 40% of reconciliation statements in this pool contain material errors, and average overcharges run 3 to 20% depending on audit history, the total annual overcharge figure falls in the $5 to $15 billion range (PredictAP, 2026). The wide band reflects genuine uncertainty about error magnitude distribution, but even the lower bound represents billions in unrecovered tenant money.
$5-15 billion in estimated annual CAM overcharges across U.S. commercial real estate (PredictAP, 2026)
The question of how many CAM reconciliation statements contain errors has been examined from multiple angles. The answer depends on where you draw the line between "error" and "material error."
25% of tenants experience billing discrepancies in their CAM statements (BOMA International, 2023)
Tango Analytics (2023) reported that 40% of CAM reconciliations reviewed across U.S. retail centers contained material errors. This has become the most widely cited statistic in the industry, referenced by PredictAP, Springbord, and numerous other sources. The original Tango Analytics source may originate from an internal analysis or conference presentation rather than a published report.
BOMA International reported through survey data that one in four tenants (25%) experience billing discrepancies. The Journal of Property Management (an IREM publication) places the error rate at 30%. These figures are more conservative, possibly reflecting different definitions of what constitutes a "discrepancy" versus a "material error."
Blackacre Advisors, a national tenant advisory firm, estimates that 90% of reconciliation statements have some errors, including minor calculation variances alongside material overcharges. Lornell Real Estate cites "national studies" suggesting 50 to 60% of reconciliations contain errors "typically in the landlord's favor."
Roughly one-quarter to one-third of CAM statements contain errors material enough to warrant recovery action. A much larger share (perhaps 50 to 90%) contain some form of discrepancy when scrutinized by experienced auditors. The 40% figure from Tango Analytics is defensible and well-sourced for material errors. The 90% figure requires the qualifier "including minor errors."
The most common CAM billing errors, ranked by how frequently they appear in audit findings and their typical financial impact:
| Error Type | Frequency in Audits | Typical Annual Overcharge | Source |
|---|---|---|---|
| Management fee overcharges | ~35% of retail leases | 1 to 2% of total CAM billed | BOMA, CTS case studies |
| Capital expenditures billed as operating expenses | ~30% of CAM disputes | Varies widely ($2,000 to $200,000+) | BOMA, Protiviti |
| Pro-rata share denominator errors | Common across all property types | $3,000 to $10,000+ per year | National Lease Advisors |
| Excluded costs improperly billed | Common in NNN leases | $1,000 to $25,000+ per year | CTS, Springbord |
| Gross-up calculation mistakes | Common in partially occupied buildings | $2,000 to $45,000+ per year | Deloitte, IFMA |
| CAM cap violations | Common in retail leases | $1,500 to $15,000+ per year | ICSC practitioner data |
BOMA data indicates that 30% of CAM disputes stem from capital expenditures improperly billed as operating expenses (BOMA, 2023). This is one of the highest-impact error categories because a single capital project can generate tens or hundreds of thousands of dollars in improper pass-through charges.
National Lease Advisors found that misallocated expenses alone can inflate CAM charges by up to 18% in mixed-use properties.
These errors compound over time. A systematic denominator error of $5,000 per year accumulates to $25,000 to $50,000 over a standard lease term. Franchise tenants with 20 locations facing the same $3,000 annual error can see $240,000 in recoverable overcharges over a four-year lookback period.
Even with ongoing review, overcharges of 3 to 5% of billed CAM persist according to Agora Real Estate. This represents a floor: the irreducible complexity of CAM calculations generates a baseline error rate that even diligent monitoring cannot fully eliminate.
15-20% of total billed CAM is typically recovered when tenants conduct first-time audits (Springbord Research, 2024)
Recovery rates jump dramatically when a professional auditor examines statements that have gone unreviewed for multiple years. IFMA (International Facility Management Association) cites savings of up to 25% from CAM audits at the upper bound.
$25,000 average recovery per audit engagement across 10,000+ completed lease audits ($250M total recovered) (Deloitte, 2023)
Deloitte's verified track record of $250 million recovered across 10,000+ lease audits yields an average of $25,000 per audit. This is a conservative figure that includes engagements with no findings.
Commercial Tenant Services (CTS), described as the largest independent lease audit firm, reports having created "over one billion dollars in lease audit value." Published case studies illustrate the range:
| Case | Recovery | Details |
|---|---|---|
| Fortune 100 company portfolio | $18 million refunded | Plus $79 million+ in future overcharges corrected |
| Single NYC tenant | $584,000 | Incorrect real estate tax base year |
| Global law firm | $415,000 | Management fees and tax overcharges |
| 75,000 SF LA outdoor mall | $186,000 | Impermissible charges |
| NYC office tenant (150,000+ SF) | $150,000 | Improper CapEx pass-throughs, duplicate billings, corporate overhead (Protiviti) |
| 48,000 SF Chicago office | $56,000 | Improper gross-up methodology |
Protiviti documented a separate case where a single parking garage renovation generated over $2 million in inappropriate pass-through costs that should have been capitalized.
No large-scale, neutral survey has measured precisely what percentage of commercial tenants audit their CAM reconciliation statements. The data gap is itself revealing: the practice is so uncommon that no major institution has measured it.
Protiviti states that "tenants rarely execute the right-to-audit clause." Moss Adams describes lease audits as "not especially common." National Lease Advisors observes that reconciliation statements at most organizations "go directly to accounts payable and get paid without review."
The directional evidence suggests that fewer than 10 to 15% of commercial tenants conduct any form of formal CAM audit in a given year. This estimate is inferred from practitioner observations rather than measured by survey, but the consistency across independent sources lends it substantial credibility.
| Tenant Type | Audit Likelihood | Vulnerability |
|---|---|---|
| National/enterprise retailers | Highest (dedicated lease admin teams) | Still rarely audit every location annually |
| Mid-market (5 to 50 locations) | Low | Large enough for errors to compound, too small for specialized staff |
| Small business tenants | Very low | Accept reconciliations at face value |
| Franchise operators | Almost never | Same systematic error can replicate across dozens of locations |
| Medical office tenants | Disproportionately low | Face some of the highest CAM exposure ($15 to $20+/SF) |
Retail tenants (especially NNN leases) show the highest audit activity, followed by office tenants. Industrial tenants audit least frequently despite large square footages, partly because per-square-foot CAM rates are lower. Medical office tenants face high CAM exposure but audit rates are disproportionately low.
Traditional CAM audit engagements typically cost:
On a $40,800 multi-year recovery, a 33% contingency firm takes $13,464 of the tenant's recovery.
CAMAudit charges per audit year on a flat-fee basis. Each credit covers one lease analysis combined with one reconciliation for one year. The 5-audit credit pack covers a full multi-year lookback at $249, or $49.80 per year audited. No contingency fees. No percentage of recovery.
On the same $40,800 multi-year recovery: $299 total audit cost versus $13,464 in contingency fees. The difference in net recovery is $13,265.
Protiviti documented a NYC office audit that produced $150,000 in agreed-upon recoveries, yielding a 375%+ ROI on audit costs. With flat-fee pricing, the ROI calculation shifts dramatically: even a $5,000 recovery on a $79 single-audit credit represents a 100x return.
Industry data indicates that 70 to 85% of formally documented CAM disputes are resolved through negotiation without litigation. Landlords generally prefer to correct verified errors rather than risk the cost and reputational impact of litigation.
Typical dispute resolution timelines:
The resolution rate improves significantly when the dispute is backed by specific, documented findings rather than a general objection. A dispute letter that identifies the exact rule violated, the dollar amount per year, and the supporting calculation gives the landlord's property manager a clear path to verify and respond.
Perhaps the most compelling evidence comes from the landlord side of the industry.
BOMA/GLA (Greater Los Angeles) wrote in February 2026: "CAM reconciliations are one of the most important responsibilities in property management, and also one of the least talked about. Many professionals find themselves responsible for them long before they ever receive formal training."
Jeffrey Lapin, former IREM Sacramento chapter president, stated: "CAM reconciliation can be intimidating for property managers who haven't been through the process before, and often do not get training on this topic from property management companies."
MRI Software found that 54% of property managers struggle with the time-consuming nature of CAM reconciliation, and 58% consider it complex.
CREModels documented clients "more than four years behind on reconciliations" because internal teams lack capacity, with one regional shopping center developer losing $55,000 in a single year from reconciliation errors.
Hughes Marino, a nationally recognized tenant rep firm, observed: "Operating expense statements are intentionally devoid of information because the last thing landlords want is to make it too easy for tenants to peer into their spending habits."
The existence of extensive BOMA and IREM training programs dedicated to CAM reconciliation is itself an institutional acknowledgment that the skill gap is real, persistent, and consequential.
What percentage of CAM reconciliations contain errors?
The most widely cited figure is 40%, from Tango Analytics' 2023 review of CAM reconciliations across U.S. retail centers. BOMA International reports 25% of tenants experience billing discrepancies. The Journal of Property Management places the rate at 30%. At the upper bound, Blackacre Advisors estimates 90% of statements have some errors when including minor variances. A reasonable synthesis: 25 to 40% contain material errors warranting recovery action.
How much can a tenant recover from a CAM audit?
First-time audits typically recover 15 to 20% of total billed CAM (Springbord Research, 2024). Deloitte's track record across 10,000+ audits averages $25,000 per engagement. For regularly audited portfolios, 3 to 5% overcharges persist as a baseline. Actual dollar amounts range from $5,000 for single-location small tenants to $18 million for Fortune 100 portfolio audits. The recovery depends on property type, lease structure, how many years go unaudited, and the specific errors present.
How much does a CAM audit cost?
Traditional audit firms charge $2,000 to $5,000 upfront per property per year, plus 25 to 33% contingency on recovered amounts. Big Four and national CPA firms charge $16,000 to $56,000 per engagement. CAMAudit offers flat-fee pricing starting at $79 for a single audit credit, with a 5-audit pack at $299 ($39.80 per year) and no contingency fees. The ROI on even a single finding typically exceeds 10x the audit cost.
What is the total market size for CAM overcharges?
PredictAP estimated in 2026 that $5 to $15 billion in annual CAM overcharges go unrecovered across U.S. commercial real estate. This is derived from a total CAM pass-through pool of $90 to $200 billion annually, with 25 to 40% error rates and 3 to 20% average overcharge amounts. The wide range reflects genuine uncertainty about error magnitude distribution across the full market.
This article is for informational purposes only and does not constitute legal or accounting advice. Statistics cited in this article originate from the sources identified and reflect data available as of the publication date. Some figures originate from industry practitioners rather than independent academic research. Verify current statistics and applicability to your specific situation with qualified professionals.
